Jaw type coupling is a common type of flexible coupling. It is made of two metal hubs and a flexible spider. The hubs can be made of steel or aluminum. The spider coupler is compact size, backlash free. The jaw type coupling has the function of absorb vibration, compliant the radial and axial tolerance. Three mounting ways: clamp type, set screw type and keyway. Different size of spiders are suitable for different hub dimensions.